Fuel economizer



April 13,1926. Y 1,580,383

J. F. SCHLAPPI FUEL EGONOMXZER Filed Nov. 25, 1925 Patented Apr. 13, 1926.

UNITED STATES J' OHN FREDRICK SCHLAPPI, 0F SIOUX CITY, IOW'A',Y

FUEL ECONOMIZER.

Application led November 23, 1925. Serial No. 71,013.

To ail whom it may concern:

Be it known that I, JOHN F REDRICK SoHLArrr, a citizen lofthe United States, and a resident of Sioux City, in the county of Toodbury and State of Iowa, have invented certain new and useful Improvements in Fuel Economizers, of which the following is a speciiication.

This invention 'relates to furnaces and more particularly to a preheating arrangement adapted to be employed in conjunction with certain elements of the preheater described and claimed in my Patent No. 1,489,853, dated April 8, 1924. n

An object of the present invention is the provision of a devicefor heating air and for projecting the same over the bed of the fire so that the soot or other forms of unburned carbon which is carried ofi by the smoke and gases will be consumed by the fresh supply of heated oxygen and thereby increase the elficiency of the furnace. f

A further object of the invention is the provision of a device for heating and distributing the heated air over the bed ofv a furnace and in which an enlarged chamber is provided for storing the air preliminarily to its heating which is in communication with a heating chamber having a plurality of baliles which causes theair to take a tortuous path. n

This invention will be best understood from a. consideration of the following detailed description, in view of the accompanying drawings forming a part of the` specification; nevertheless it is toy be understood that the invention is not confined to the disclosure being susceptible of such changes and modifications which shall deline no material departure from the salient features of the invention as expressed in th appended claims. i

In the drawings:

Figure 1 is a view in perspective of my preheater shown applied to a furnace door.

Figure 2 is a transverse vertical section of the heater.

Figure 3 is a vertical section of a modified form of the air heater.

Referring more particularly to the drawings, 10 designates a door which is hinged at 11 to the flanged opening 12 which forms an entrance for the insertion offuel to the furnace 13.

The door is provided with a plurality of passages adapted to receive securing bolts- 14 whereby the various sections of the prveheater are bolted together and secured to vided with a lower open end 16 forming'an l air inlet. In Figure 3 an inlet pipe 17 having a downturned portion open at its end and covered by a screen 18 is integrally formed with the casing 15a. The inner open edge as shown at 19. of the casing 15 in both forms is; in engagement with the outer face of the `door 10.

A second casing 2O has .an open end in Contact with the inner face of the door'lO while the other end yis provided with an annular flange 21 adapted to receive the inner'end of a third casing 22. The casing 2O is adapted to normally project through the opening 12 in the furnace when the door` l0 is in closed position. The outer end of the casing 2O is providedwith a closure 23 which is cutaway as at 24 to provide anV elongated vair passage for connecting the casing 22 ywith the casing 20 attheir upper en s. f

The casing 22 isclosed at shown at 25 except for an elongated slot 26- at the lower end. Arpair `of battles 27 and 28 project inwardly from the inner face of the wall 25 and are not only integrally formed with said wall but also withv the side walls 29 of said casing. The battles 27 and 28 falllshort of the width of the casing22 so that spaces 30 and 31 are provided to providel air passages. p. A third baiiie 32 is formed-integrally with the side wall 29 of the casing 22' and terminates short of the inner wall 25 in order to provide an air passage 33 between the free end of thebaiile 32 and the vwall 25. inner end 34 of the baiile 32 is in contact with the outer face of the wall 23 of the easing 20. c

The door 10 is'provided with perforations through which the bolts 14 are inserted and the usual heads and nuts are employed for locking the sections15, or 15a, 20 and 22 in alined position and to the door so that the casings are carried directly by the door. The door 10 is also providedwith perforations 35 through which air from casing 15 may be admitted to Vcasing 20.

The operation of my device is as follows:

Air passing through the tubular member 17 or through the port 16 enters casing 15 or The Y a and through passages S5 the air is admitted to casing 2O Where it is initially heated. The heated air rises, passing over the top of wall 23 through the elongated slot 24 and into casing 22 Where it is bal-lied by the member 28 and due to the suction in the furnace the heated air is then draivn through passages 30, and 31 and then through the elongated slot 26 in the outer Wall 25 of the casing 22. The restrict-ed and elongated slot 26 being located directly over the lire in the furnace supplies the flame with additional air Which is heated so that particles of the smoke which are normally carried to the chimney in an unburned condition is consumed due to its contact With the oxygen of the air so that the intensity of the flame is increased and the efficiency of the furnace is greatly improved.

This construction provides a chamber in the casing l5 or 15a in which the air is preliminarily collected which passes to the initial heating chamber 20. This chamber being formed of metal is heated to a predetermined degree but not to the extent that the casing 22 is heated because of the fact that casing 22 is more directly located over the flame so that the airis heated progressively from casing 15 through casings 2O and 22 so that When it finally reaches the hot gases and smoke it will be in con-dition to cause greater combustion of the unconsumed particles of carbon Which Would otherwise be dissipated through the chimney.

The device shown in Figure 2 with the large port 16 is adapted for use in large furnaces, While the construction disclosed in Figure 3 is employed in the smaller furnaces used in houses.

W'hat I claim is:

l. A fuel economiser for furnaces comprising a plurality of casings adapted to be secured together and supported by a furnace door, one 'of said casings having a closed end, the o oposite end being in engagement With the urnace door, the closed end being provided with an air inlet opening, the second casing having one end in engagement with the furnace door and alining with the first mentioned casing, the second casing having the end open which engages the furnace door and the opposite end closed, a portion of the upper edge of the closed end of the second casing being provided with a slot, a third casing being alined with the second casing and provided with a plurality of baf fles extending horizontally and longitudinally of the casing for causing the air to assume a tortuous path through the third casing, the third mentioned casing having its outer end closed with the closed end having a slot adjacent its lower enu and below a baffle.

2. The combination with a furnace door and a fuel economizer, a plurality of casine's adapted to be secured together and suipordted by a furnace door, one of said casings having a closed end, the opposite end being in engagement with the furnace door, the 'closed end being provided With an opening, an air inlet conduit connected with the closed end and alining With the opening, the second casing having one end in engagement With the furnace door and alining with the first mentioned casing, the second casing having the end open which engages the furnace door and the opposite end closed, a poition of the upper edge of the closed end of thc second casing being provided with e slot, a third casing being alined with the second casing and provided with a pluralitv of baffles extending horizontally and longitudinally of the casing for causing the air to assume a tortuous path through the third casing, the third mentioned casing having its outer end closed With the closed end havinga slot adjacent its loiver end and below bafle, the furnace door separating the vlirst tivo casings from each other and being pro-4 vided ivith openings for placing the chambers in communication with each other.

JOHN FREDRICK SCHLAPPI. 

